Theoretical prediction of flange wrinkling in the first-pass conventional spinning of dual-metal sheets

2021 ◽  
Vol 62 ◽  
pp. 368-377
Author(s):  
Juan Huang ◽  
Junsong Jin ◽  
Lei Deng ◽  
Xinyun Wang ◽  
Pan Gong ◽  
...  
Keyword(s):  
Theoretical Prediction ◽  
Metal Sheets ◽  
First Pass ◽  
Flange Wrinkling ◽  
Conventional Spinning ◽  
Dual Metal

A study of severe flange wrinkling in first-pass conventional spinning of hemispherical part

2017 ◽  
Vol 93 (9-12) ◽  
pp. 3583-3598 ◽  
Author(s):  
Qingshuai Kong ◽  
Zhongqi Yu ◽  
Yixi Zhao ◽  
Hao Wang ◽  
Zhongqin Lin
Keyword(s):  
First Pass ◽  
Flange Wrinkling ◽  
Conventional Spinning

Determination of formability considering wrinkling defect in first-pass conventional spinning with linear roller path

2019 ◽  
Vol 265 ◽  
pp. 44-55 ◽  
Author(s):  
S.W. Chen ◽  
P.F. Gao ◽  
M. Zhan ◽  
F. Ma ◽  
H.R. Zhang ◽  
...  
Keyword(s):  
Roller Path ◽  
First Pass ◽  
Conventional Spinning

Instability in Conventional Spinning of Cones

1963 ◽  
Vol 85 (1) ◽  
pp. 44-48 ◽  
Author(s):  
S. Kobayashi
Keyword(s):  
Deep Drawing ◽  
Flange Wrinkling ◽  
Conventional Spinning ◽  
Theoretical Results ◽  
Theory And Experiments

The condition of flange wrinkling in conventional spinning of cones is established by modifying the theory of instability in deep-drawing of cups. Experiments conducted in order to test the theoretical results show that agreement exists between theory and experiments.

Roller Trace Design in Multi-Pass Conventional Spinning Based on Cylindrical Part

2020 ◽  
Author(s):  
Li Zixuan ◽  
Shu Xuedao ◽  
Ye Bohai ◽  
Wang Jitai
Keyword(s):  
Cylindrical Part ◽  
Feed Ratio ◽  
Thickness Uniformity ◽  
First Pass ◽  
Spinning Process ◽  
Conventional Spinning ◽  
Thickness Variations ◽  
Product Thickness ◽  
Trace Curves ◽  
Involute Curve

Abstract Conventional spinning is a kind of ancient revolving process which controls the product’s shape by roller trace design. It is also widely used in civil, military, automobile, aerospace and other fields. Unlike the power spinning process, the roller trace used in conventional spinning is complex. Both thickness uniformity and crack defects are affected by it. However, roller trace design is still based on experience without a solid theoretical basis. This paper simulated five different roller trace curves: involute curve, circular curve, Bezier curve, conchoids and line. Experiments using superalloy GH3030 were conducted in conjunction with a multi-pass conventional spinning simulation model. Blank thickness variations, mandrel and roller forces of different roller traces in the first pass are analyzed and assessed through the verification experiments. The results suggest that the curve trace parameters play a key role on the product thickness uniformity. And the distribution of Bezier and conchoid roller traces is more uniform than the other traces. The axial force of mandrel is a very important factor in the design of tool load capability. Larger roller feed ratio and proper roller traces can reduce the thinning which may avoid the cracks.

Embedding Procedure for Water Swollen Samples

1970 ◽  
Vol 28 ◽  
pp. 504-505
Author(s):  
Ann M. Thomas ◽  
Virginia Shemeley
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Exchange ◽  
Structural Changes ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Transmission Electron ◽  
First Pass ◽  
Exchange Resins

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

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